11 error stands for ERROR_SSH_INVALID_PACKET_SIZE. Please try to follow next steps: https://www.eldos.com/security/articles/4796.php If this doesn't help you may try to use the latest components version as both SFTP protocol and our components are improved from time to time.

The problem exists at a client of mine and I'm afraid they don't want me to share the server address.....I will experiment with properties myself....do you have any suggestions about which properties I might change?

All algorithm-related properties, then all buffer-related ones one by one. There are millions of combinations so without having access to the server you are out of luck, that's for sure. We know how to speed up the procedure, but that's an expert knowledge which is intuitive (based on our experience) and can't be formalized in the answer.

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